You are here: Home > Support > Knowledge Base > Incorrect Light Distribution from Light Fixtures

Incorrect Light Distribution from Light Fixtures

Tuesday, March 5th, 2019

Problem: The light distribution from one of your light fixtures does not extend in the right direction relative to the block and/or does not originate from the correct point on the block.

Cause: There is an incongruity between your light fixture block and the IES file associated with it.

Typically, IES files extend in the direction of angle 0, which is the same direction most blocks face. If the file was not oriented correctly, the light distribution will extend at an odd angle from the block.

The origin of the light distribution is determined by the Design Master attribute CON_CENTER, or the insertion point if the attribute is not present. If the origin is not correct (for example, a block for a lamp mounted to a pole has its origin at the pole), the light distribution will not be correct.

 

Solution 1: Account for the differences in the Light Fixture Project Schedule. This solution allows you to change the light fixture for a given IES file in the current project without affecting the block definition.

Ribbon: DM Electrical->Devices-> dm_elec-ltgPS Light Fixture Project Schedule

Pulldown Menu: DM Electrical->Light Fixtures->Light Fixture Project Schedule

In this dialog box, the IES Rotation value rotates the light distribution. The Arm Length value moves the light distribution origin in the direction of the rotation angle.

 

Solution 2: Account for the differences by making changes to the block using the Open Block from Drawing command. This solution allows you to modify the block so it will always work with a particular IES file.

Ribbon: DME: Customization->Block Creation->Open Block from Drawing

Pulldown Menu: DM Electrical->Customization->Open Block from Drawing

Select the block you want to change.

If the direction is off, rotate the block to match the light distribution.

If the origin is off, move the CON_CENTER attribute to the correct location or, if the attribute is not present, move the block so the insertion point is centered on the correct location.

Save the block, then run the Redefine Block in this Drawing command and select the light fixture block.

Ribbon: DME: Customization->Block Creation->Redefine Block in this Drawing

Pulldown Menu: DM Electrical->Customization->Redefine Block in this Drawing

The block will update to reflect the changes. Continue making changes until the block and light distribution line up correctly.

Related Articles

Filter by
Post Page
Electrical Electrical RT Calculations Light Fixtures HVAC Load Calculations Distribution Equipment (Panels and Transformers) Circuiting
Sort by

How Building Angle Affects Calculations

The “Building Angle” setting offsets the axes along which wire length calculations are performed, which can greatly impact several figures in your project.

8

Foot-candle Levels Inside Building Outlines

When drawing building outlines for outdoor photometrics, make sure you use the Insert Photometric Solid: Rectangle or Shape commands if you do not want foot-candle levels to be measured inside the area.

8

Base Units and Photometrics Calculations

If your photometrics calculations appear too condensed or spread out, you may have your base units set incorrectly.

6

Exporting Load Calculations (and Other HTML Outputs) to Excel

Some HVAC and Electrical reports can be exported as HTML files. Here are three easy ways to open those files in Excel.

0

4-Pole Transfer Switches

Design Master does not offer 4-pole voltage options for transfer switches; however, you can safely model them using a 3-pole voltage and notes.

0

Circuiting and Homeruns with Junction Boxes

You cannot circuit the junction box device type, but you can model a different device type after a junction box and circuit that.

0

Products

Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

System Requirements

Support

Contact Support

Install & Update Instructions

Online Training

Knowledge Base

User Manuals

Tutorials

Release Notes

Downloads

Wish List

Remote Support

Company

About

Customer Stories

Awards

Newsletter

Blog

Pricing

Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

Free Trial

Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

866-516-9497
19401 40th Ave W, Suite 302
Lynnwood, WA 98036
support@designmaster.biz

©2001-2021, Design Master Software, Inc